Soldering composition



Patented July 23, 1929.

UNITED STATES PATENT OFFICE.

KARL GEISEL, OF LEVALLOIS-PERRET, FRANCE, ASSIGNOR, BY MESNE ASSIGNMENTS, T ALUMINUM SOLDER CORPORATION OF AMERICA, OF NEW YORK, N. 'Y., A GOR- IPOBATION OF DELAWARE.

SOLDERING comrosr'rron.

1T0 Drawing.

5 improved soldering compositions may how-.

ever be used for other metals as well. My invention is especially suitable for soldering castings such' as aluminum crank cases of internal combustion engines for motor cars.

The new soldering compositions produce joints of remarkable strength.

The new compositions consist of aluminum, zinc, and tin, in proportions which may be varied Within certain limits, particularly for varying the temperature at which the solder ing operation is to be performed.

Three typical and satisfactory composi- )tions are as follows:

The parts are given by weight.

Composition I is intended particularly for tinning and requires a temperature of about 230 to 240 centigrade for its proper application. Composition II is the solder proper Application filed September 21, 1928. Serial No. 307,554.

for connecting or uniting separate pieces of metal (whether of thesame or of difi'erent metals), or different parts of the same pieces; the soldering temperature for composition II is about 260 centigrade. Composition III is intended particularly for soldering relatively heavy work, and requires a soldering temperature of about 400 centigrade.

The compositions are prepared by melting 40 the three ingredients together in any suitable manner, and then casting the resulting mass or solder into bars, ribbons, strips, or any other suitable form.

' The three examples given above indicate the use ofaluminum Within the range of from 4 to 15 per cent, zinc within the range of about 40 to 60 per cent, and tin within the range of about to 25 per cent. It will be noted that asthe percentage of aluminum is increased, that oftin is decreased.

Various modifications may be made without departing from the nature of myinvention as set forth in the appended claim.

I claim:

-A soldering composition consisting of about 4 A (by Weight) of aluminum, 66%% of zinc, and 29% of tin, and having a soldering temperature of about 260 centigrade.

In testimony whereof I have hereunto set 6 my hand.

KARL GEISEL. 

